Rotary hydraulic ratio pump



y 24, 1956 A. G. HALVORSEN 2,755,744

ROTARY HYDRAULIC RATIO PUMP Filed Nov. 4, 1952 2 Sheets-Sheet 1 INVENTOR,4: WV 5 #41 V0255 BY ww m l/j ATTORNEY July 24, 1956 A. G. HALVORSEN2,755,744

ROTARY HYDRAULIC RATIO PUMP Filed Nov. 4, 1952 2 Sheets-Sheet 2 INVENTOR41 w/v G L/AL V025N m5 ATTORNEY United States Patent ROTARY HYDRAULICRATIO PUMP Alvin G. Halvorsen, Houston, Minn.

Application November 4, 1952, Serial No. 318,648

3 Claims. (Cl. 103-121) This invention relates to a rotary hydraulicratio pump, and has for one of its objects the production of a pumpwhich may be used as an hydraulic all ratio transmission automatic pump,as an hydraulic motor and motor meter, as a ratio hydraulic lift, as awater pump, and for other purposes.

A further object of the present invention is the production of a simpleand efiicient pump having an outer rotor and an inner eccentricallymounted rotor, the outer rotor carrying a hinged vane which is slidablein the inner rotor and the outer rotor also carrying vanes which arehinged to constitute swinging gate vanes loosely fitting in socketsformed in the inner rotor in a manner whereby the outside rotor may beused to provide outside power when used as a motor, the eccentricmounting of the inside rotor controlling the inside rotor.

Other objects of the present invention will appear throughout thefollowing specification and claims.

In the drawings:

Figure 1 is a side elevational view of the pump casmg.

Figure 2 is an edge elevational view thereof, certain parts being shownin section.

Figure 3 is a side elevational view of the inner and outer rotors.

Figure 4 is a diagrammatic view illustrating the movement of theeccentric.

Figure 5 is a diagrammatic view illustrating a movement of the eccentricand the operating lever movement.

Figure 6 is a further diagrammatic View illustrating a differentposition of the lever and eccentric.

Figure 7 is a side elevational view of the outer rotor, partly insection.

Figure 8 is a side elevational view of a modified type of inner rotor.

Figure 9 is a side elevational view of one of the guide members for thevanes which engage the inner rotor;

Figure it) is an end view of one of the guide members, the vane beingshown in transverse section.

By referring to the drawings in detail, it will be seen that it;designates the outer casing or housing of the pump which is providedwith a cover plate 11. The cover plate 11 is secured to the casing orhousing 10 by means of suitable bolts 12. The cover plate 11 is providedwith an inlet pipe 13 and an outlet pipe 14 which communicate with theinterior of the casing 10 for the admission of fluid to and from theinterior of the casing 10 under the action of rotation of the rotorshereinafter described. The pipes 13 may be used as an outlet and thepipe 14 may be used as an inlet, if desired, the use of the pipes beingreversed within the spirit of the invention and being optional.

An outer rotor 15 is mounted within the chamber 16 of the casing and thepipes 13 and 14 communicate with this chamber 16 to carry the flow offluid to and from the chamber 16 in a conventional manner. Wedge-likegaskets or sealing rings 17 and 18 are interposed between the outerrotor 15 and the cover plate 11, as is shown in Figure 2, to provide afluid seal therebetween. One face of each ring is at an approximately 30angle, as shown in Figure 2, to provide a maximum seal between the rotorand the cover plate.

The outer rotor 15 is provided with a chamber 19 in which iseccentrically mounted the inner rotor 20. An elongated primary vane 21is hingedly secured to the outer rotor 15 by means of a hinging head 22which fits within a circular socket 23 formed in the outer rotor 15, asis shown in Figure 3. The socket 23 is provided with flaring walls 24and 25 to provide a flaring communicating opening from the socket 23with the chamber 19. These walls 24 and 25 are preferably 37 /2 degreesor maybe 45 degrees of angle to permit the vane 21 to freely swing. Thevane 21 is provided with a tapering neck 26 adjacent the hinging head22, the sides of the neck conforming to the angle of the walls 24 and 25to prevent interference with the swing of the vane 21.

The inner rotor 20, which is eccentrically mounted within the chamber 19of the outer rotor 15, is provided with a transversely extending slot 27in which one end of the vane 21 is slidably mounted, as is shown inFigure 3. The outer rotor 15 is provided with fluid recesses 28 whichcommunicate with the chamber 19 and extend to points in close proximitywith the respective pipes 13 and 14 to facilitate in and out flow offluid from the chamber 19. These recesses 28 taper as at 29 at the endsthereof.

The inner rotor 20 is provided with angularly radiating spaced vanereceiving recesses or pockets 30 and 31, into which the respective smallauxiliary gate vanes 32 and 33 fit in the manner shown in Figure 3. Thepockets are of greater size than the vanes 30 and 31. The vane 32 ishingedly secured to the outer rotor 15 by means of the hinging head 34fitting in the circular socket 35. The vane 32 is provided with atapering neck 36 leading to the head 34 and the socket 35 is providedwith diverging walls 37 at an angle radiating preferably at 37 /2degrees to facilitate free swing of the gate vanes 32 and 33. The vane33 is similarly constructed and mounted as is shown in Figure 3.

The outer rotor 15 is provided with a shaft 38 which extends through abearing 39 and the eccentrically mounted inner rotor 20 is provided witha shaft 40 which extends through a bearing 41. A suitable lever 42 maybe secured to the shaft 40 to facilitate the control of the eccentricbearing.

It should be understood that the vane 21 which is hinged to the outerrotor 15 and which slidably fits in the slot 27 of the inner rotor 20will hold the inner rotor steady while the pump is in operation. Thesmall swinging gate vanes 32 and 33 provide a means to cause the pump torun smoothly. The wedge-like tapering gaskets or sealing rings 17 and18, the taper of the rings being approximately 25 to 30 degrees toadequately seal the junction of the cover plate 11 with the casing orhousing 10.

The operation of the pump is as follows:

It should be understood that the outer rotor 15 and the inner rotor 20are in the positions shown in Figure 3 when pumping starts. The arrowindicates direction of rotation. The fluid enters inlet 13 and passesout through outlet 14 and the swinging gate vane 21 forms a vacuum onone side thereof while on the reverse side it creates pressure. Thevanes 32 and 33 then swing shut against the inner rotor 20 to createpressure on one side thereof and a vacuum on the other side thereof. Theentrances of the slot 27 and recesses or pockets 30 and 31 are equallyspaced from each other.

In Figure 4 the arrow indicates one half movement of the eccentric andis accomplished by a A; drop in its distance of movement on the endplate of the device and firth drop in its distance of movement on theeccentric.

By moving the eccentric a distance of /tfll of its distance of movement,this permits the inside rotor to center. The vertical lines A and B showthe otf set position to one side of the normal center for centering theinner rotor 20 within the outer rotor 15. The line A indicates thecenter or" the cover or end plate 11 for the pump and the line B showsthe distance of movement of the cocentric which is approximately in astraight line to the right of line A. The inlet and outlet are indicatedby the arrows which are properly designated. It should be noted that thevanes 32 and 33 during operation swing shut from rotation of the outerrotor with respect to the vane 21 which vane 21 pulls the inner rotoralong to provide rotary motion. The vanes 32 and 33 shut from thepressure or vacuum depending upon the use of fluid or air. The outerrotor may be rotated or driven in any desired manner, and the innerrotor is driven by means of the vane 21.

In Figure there is shown the position of the rotor 20 with a Ath of thedistance of movement of the cam actuating lever 42.

In Figure 6 the eccentric is shown with a /3 distance of swing of theeccentric lever. This is accomplished by moving the eccentric 3/ of aninch down and of an inch to one side. Since the eccentric is also of aninch, this moves the inner rotor 20 in practically an up and downmovement inside of the rotor 15, as shown in the dotted position.

The fluid enters the inlet in a conventional manner and when the pumprotates in either direction a vacuum is created upon one side of thevanes and a pressure on the other, and vice versa when reversed. Whenthe inner rotor 20 is raised, the pumping is less, and when it islowered, the pumping is in greater volume. When the eccentric is turnedall the way down, the pump actuates rapidly but requires more power tooperate the same.

In Figure 8 there is shown a modified form of inner rotor, wherein therotor 20:; is provided with a slot 43 similar to the slot 27. Circularcavities 44- and 45 are provided in place of the pockets 30 and 31 shownin Figure 3. Guide members 46 and 47 are fitted in these cavities 44 and45 respectively. The cavities 44 and 45 are less than completelycircular and slightly more than semi-circular, thereby definingrestricted openings to retain the guide members against accidentaldisplacement as shown in Figure 8. Vanes similar to the vanes 32 and 33fit within the slots 48 and 49 which are formed in these members 46 and47. When the device is used as a water pump the inner rotor may be madeof plastic if desired. The guide members 46 and 47 are similarlyconstructed, and attention is invited to Figures 9 and which illustratethe construction of the guide member 46. The guide member 46 comprises acylindrical body having a longitudinal slot 48 open on one side andclosed at the other side by a bridge portion 50. The guide member 46 isprovided with a similar slot 49. A vane 32a similar to the vane 32 fitsin the slot 48 of the guide member 46 and a vane 33a fits in the slot 49of the guide member 47. This structure provides a smoothly running pump.

The recess 28 formed in the inner face of the'outer rotor provides afuel reservoir or receiving recess to contain an adequate amount ofinlet and outlet fluid. This is of advantage in a rotary motor where theinlet and outlet openings cannot be too long or too large because oflack of space. If the openings are too long or too large, one openingwill interfere with the other opening and efficiency will be lost.Furthermore, the recesses permit pressure to be directed against theoutside rotor when the pump runs at a high rate of speed during whichtime the inlet vacuum pull will be at a maximum and the recess openingswill be completely filled with fluid. When the recess openings arecompletely filled, the outer rotor will operate as if no recesses wereformed therein, until the fluid is removed or is in the process of beingremoved.

I claim:

1. A pump of the class described comprising a casing, fluid inlet andoutlet ports for said casing, an inner rotor, and an outer rotor mountedin said casing, said inner rotor being eccentrically mounted in saidouter rotor, said outer rotor having a concentric fluid recess upon itsinner face intermediate the inner eccentric rotor said said outer rotor,thereby defining a reservoir fuel channel therebetween in which anadequate amount of fuel is compressed as the inner eccentric rotor movestoward the recess of the outer rotor upon rotation, the inlet and outletports communicating with said recess, a primary vane hinged to the outerrotor and slidably en-. gaging the inner rotor to steady the innerrotor, a plurality of auxiliary vanes hinged to the outer rotor andloosely engaging the inner rotor for facilitating the smooth running ofsaid pump, the fluid being adapted to be compressed within said recessbetween the rotors as the inner eccentric rotor rotates within the outerrotor.

2. A pump as defined in claim 1, wherein the inner rotor is providedwith circular cavities having restricted openings, guide membersrotatably mounted in said cavities of said inner rotor, each guidemember being formed of one piece, and said auixiliary vanes beingslidably mounted through said guide members.

3. A pump as defined in claim 1, wherein the casing is provided with anopen side, a cover plate closing said open side, and wedge-like gasketsdefining scaling rings interposed between said outer rotor and saidcover plate, said gasket having an inclined face at an angle ofapproximately 30".

References Cited in the file-of this patent UNITED STATES PATENTS1,352,107 Wagenhorst Sept. 7, 1920 1,695,650 'Godillot Dec. 18, 19281,806,206 Lees May 19, 1931 1,828,245 Davidson Oct. 20, 1931 1,961,592Muller June 5, 1934 FOREIGN PATENTS 266,514 Great Britain Mar. 3, 1927848,518 France July 24, 1939

